Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a6fd5ad724b8fa…

MALICIOUS

PDF

70.5 KB Created: 2021-02-13 00:29:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 00404319c53aebeb6240049817e75017 SHA-1: 15e12887137a9f4f0ef13f449599ce7011ec5ef5 SHA-256: 78a6fd5ad724b8fae9a039ea912855fd03913cf093bec6f075c06d8b1ab0a9f8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. While no scripts were explicitly extracted, the nature of the link farm suggests it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/123?utm_term=ipod+shuffle+3rd+gen+user+guide PDF link annotation
    • https://cdn.sqhk.co/vugasoveg/UhiljbA/derailed_2005_movie_trailer.pdfIn PDF document text
    • http://erogan24.website/vupaxidonaxijikenrtih1.pdfIn PDF document text
    • http://sodahub.pro/pizujelomosibuwekawakajii2zg.pdfIn PDF document text
    • https://magenudelekoj.weebly.com/uploads/1/3/5/9/135975171/9082103.pdfIn PDF document text
    • https://mesakarune.weebly.com/uploads/1/3/1/3/131380767/4741fd4.pdfIn PDF document text
    • http://ellmax-site.xyz/pigutedutx4rtv.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/458b4b5832db.pdfIn PDF document text
    • https://cdn.sqhk.co/jekurona/hc7fw6x/classic_labyrinth_3d_maze_free_games.pdfIn PDF document text
    • http://fesabip.iblogger.org/logical_framework_template.pdfIn PDF document text
    • http://geniputan.66ghz.com/los_angeles_rams_injury_report_today.pdfIn PDF document text
    • https://cdn.sqhk.co/kubafipefo/hgCihLt/xitob.pdfIn PDF document text
    • https://cdn.sqhk.co/bidomutarili/hbfoNKj/nojumo.pdfIn PDF document text
    • https://cdn.sqhk.co/wisisatofife/HYZieAj/big_farm_story_mod_apk_download.pdfIn PDF document text
    • http://japancar-sib.ru/57060693834ntvtn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://lefanivewog.epizy.com/vedidokokidujule.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC921 4996 bytes
SHA-256: 9058d3bffc6d8f7fe30606df139e1dd90377783ade9a83f7d2ebfbe55307a81b
font_01_sfnt_off0000da0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0F 10240 bytes
SHA-256: 3364799cd5c0e5e0aa7ca598d104b2cf508e271e9fd3300cd35ef74f750f2b68
font_02_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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